package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;


@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     * @throws IOException
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        log.info(file.toString());
        //获取原始文件后缀 //假如是abc.jpg 得到.jpg需要使用sbust..方法
        String originalFilename = file.getOriginalFilename();
        String sub = originalFilename.substring(originalFilename.lastIndexOf("."));

        String uid = UUID.randomUUID().toString()+sub;

        //生成随机存储文件夹
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd/");
        String format = sdf.format(new Date());
        String savePath = format + uid;              //2022/06/13/dfsdfdfd.jpg

        //创建一个目录对象  - 目录不存在，需要创建
        File dir = new File(basePath + format);          //  D:\img\yyyy\MM\dd\
        dir.mkdirs();

        //将临时文件转存到指定位置
        file.transferTo(new File(basePath + savePath));

        return R.success(savePath);

    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){


        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
